/*
 * seed_icm.h
 *
 * Header for SEED Integer Counter Mode.
 */

#ifndef SEED_ICM_H
#define SEED_ICM_H

#include "seed.h"
#include "cipher.h"

typedef struct {
  v128_t   counter;                /* holds the counter value          */
  v128_t   offset;                 /* initial offset value             */
  v128_t   keystream_buffer;       /* buffers bytes of keystream       */
  seed_expanded_key_t expanded_key; /* the cipher key                   */
  int      bytes_in_buffer;        /* number of unused bytes in buffer */
} seed_icm_ctx_t;

err_status_t
seed_icm_context_init(seed_icm_ctx_t *c,
		     const unsigned char *key); 

err_status_t
seed_icm_set_iv(seed_icm_ctx_t *c, void *iv);

err_status_t
seed_icm_encrypt(seed_icm_ctx_t *c,
		unsigned char *buf, unsigned int *bytes_to_encr);

err_status_t
seed_icm_output(seed_icm_ctx_t *c,
	       unsigned char *buf, int bytes_to_output);

err_status_t 
seed_icm_dealloc(cipher_t *c);
 
err_status_t 
seed_icm_encrypt_ismacryp(seed_icm_ctx_t *c, 
			 unsigned char *buf, 
			 unsigned int *enc_len, 
			 int forIsmacryp);
 
err_status_t 
seed_icm_alloc_ismacryp(cipher_t **c, 
		       int key_len, 
		       int forIsmacryp);

#endif /* SEED_ICM_H */

